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Why
TECO Middle East?
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TME is certified by Westinghouse to use its
Thermalastic Epoxy Insulation system for its coils’ insulation
and it is what makes TME Coil products far better from the others.
The TME
Difference
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Thermalastic®Epoxy Insulation
The Thermalastic ® insulation system was
introduced by Westinghouse on large turbine generators in 1949.
Since then it has become the most imitated system in the motor
industry. Thermalastic ® Epoxy is a premium system, proven by more
than 30 years of outstanding in-service performance and backed by
continous development. All Westinhouse AC machines with operating
voltages 380 V through 13.8 KV utilize the Thermalastic ® Epoxy
post-impregnated system. In rare cases due to physical size
limitations, a pre-impregnated system may be used.
The Thermalastic ® Epoxy insulation system is a
mica-based system in that it uses mica for turn-to-turn insulation
(when expected surge voltage is greater than surge withstand
capability of straninsulation) and exclusively for ground insulation
because of its outstanding dielectric properties. Mica was selected
for this system because it has long been recognized as the most
reliable insulating material available.
Post-impregnation assures the reliability of
this system. All of the components— fully insulated stator coils,
coil-to-coil connections and bracing system parts—are completely
installed into the stator before the entire unit is vacuum pressure
impregnated in the Thermalastic ® Epoxy resin. This procedure makes
it possible to achieve the highest degree of resin fill of the
various winding components, helping them develop their best
electrical and mechanical properties.
The Thermalastic ® insulation system for
Westinghouse AC machines is a class F insulation system. Class F
insulation provides a comfortable operating thermal margin over
Class B temperatures generally specified by customers. Westinghouse
insulation systems have been through rigorous testing, including
ANSI/IEEE 275, and tests for electrical strength, voltage endurance,
moisture resistance, chemical resistance, thermal cycling,
mechanical strength, and abrasion resistance.
Coils Manufacturing Process
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Loop Winding - Winding of the
coil strands according to the specifications.
Hot Pressing - Hot pressing of
the straight part of the coils. The hot melt adhesive is part of the
mica tape used for the insulation of the conductors.
Spreading/Forming - Spreading of
the looped coils to form it according to the specifications.
Taping - Applying the main wall
insulation tape in the straight part and about half of the evolvents.
Finished Product
Layer Insulations &
Motor Windings
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Types of Layer Insulations
Motor Windings
Form Coil - With
rectangular wires, world series can be used.
Random Wound - With enamel wire
used in low voltage only.
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